+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120820 (1998 HL89) Classification: Main-belt Asteroid          SPK-ID: 2120820 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .083539636187398 4.0862e-08   a 2.744883111030839 1.6588e-08 au q 2.51557657455839 1.1836e-07 au i 13.52119017020438 4.6007e-06 deg node 206.9103680287305 1.6711e-05 deg peri 302.18279567 3.7157e-05 deg M 50.03895775717485 2.9682e-05 deg tp 2458969.618059426657 (2020-Apr-30.11805943) 0.00013746 TDB period 1661.055751995266 4.55 1.5057e-05 4.122e-08 d yr n .216729630879377 1.9647e-09 deg/d Q 2.974189647503289 1.7974e-08 au   Orbit Determination Parameters    # obs. used (total)      900      data-arc span      8063 days (22.08 yr)      first obs. used      1998-04-21      last obs. used      2020-05-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55159      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 17:54:31   Additional Information  Earth MOID = 1.55019 au   Jupiter MOID = 2.0731 au   T_jup = 3.303  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.12   n/a E2021B55   120820 (1998 HL89)          Discovered 1998-Apr-21 by LINEAR at Socorro Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-03 19:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin